Let's do this as a combined thread for WLAN drivers and problems.
I want to use this first post as a download-page, so if you have anything what's working whisper it to me and I add it here.
Of course I can't test all drivers, it would be good if there're people who can do this.

D-Link DWL-G122, A big driver with own preferences pane. Uses RaLink driver packages. Links are in italiano:

http://inlinestreet.altervista.org/sito/Driver/Voci/2007/12/7_Dwl_G122_%3A_D-link_usb_Wi-Fi__.html
http://forum.insanelymac.com/index.php?showtopic=68995&hl=DWL-G122

Driver for Atheros USB chipsets:
http://www.macupdate.com/info.php/id/21816/atheros-wlan-usb-driver

At last a link from insanelymac:
http://forum.insanelymac.com/index.php?showtopic=34071&hl=11n

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2 Opteron systems: OSx86 10.5.8, Andy's 9.8.0 kernel, Asus A8N-SLI Premium, Opteron 185 o'clocked @ 2 x 2,95 GHz (2nd system 2.6 GHz), ATI Radeon HD2600XT 256MB Dual-Monitor 2x HP L2035, 4 GB RAM, Griffin FireWave as main audio device, Marvell + nForce LAN, Asus U3S6 USB3/SATA6 card, 5,5 TB harddisk, Firewire 800 card, Apple Remote + eHome IR receiver, 2x Wacom serial graphics tablet, Canon Pixma iP4700, Logitech Internet Navigator wireless keyboard/mouse combination.

My Audio stuff: M-Audio Transit USB (default audio), M-Audio ProFire 610, M-Audio ProFire Lightbridge (34 channels) using Creamware A16 ADAT converter • MIDI: M-Audio Midiman 4x MIDI interface • Behringer Audio Mixers: Xenyx 1002, Xenyx 1002FX, Xenyx 1202FX, Eurorack UB1002FX, Eurorack MX1804FX, Eurorack MX262A • FX devices: Lexicon MPX100 DSP, Behringer DSP-1000 Virtualizer, Behringer MiniFEX 800 DSP, Behringer Multicom Pro MDX4400 compressor • RETRO: MSSIAH midi/sequencer/synthesizer cardridge for the C64 (Dual-SID), Steinberg M.S.I. MIDI Interface for C64